Each license issued under this Division shall be conspicuously displayed at all times in the licensee's place of business. A copy of the secondhand and pawn dealers ordinance, consisting of Division 19 of Subtitle 5 of the Prince George's County Code, shall be displayed in a conspicuous place in the licensee's place of business so that it may be readily seen and read by persons entering the premises and employees of the licensee's place of business. A sign shall be posted in a conspicuous place visible from the main entrance of the licensee's place of business containing the following message in letters of at least one and one-half (1½) inches in height and a corresponding width: "RECEIVING, IN EXCHANGE FOR MONEY, TRADE, BARTER, OR OTHER VALUABLE CONSIDERATION COSMETICS, DEVICES, DRUGS OR MEDICATIONS, FOOD OR FOOD ADDITIVES FOR HUMAN CONSUMPTION IS PROHIBITED".